diff --git a/api/@ohos.backgroundTaskManager.d.ts b/api/@ohos.backgroundTaskManager.d.ts
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+/*
+ * Copyright (c) 2022 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { AsyncCallback , Callback} from './basic';
+
+/**
+ * Manages background tasks.
+ *
+ * @since 7
+ * @sysCap SystemCapability.Ressched.BackgroundTaskMgr
+ * @devices phone, tv, wearable, tablet, car
+ */
+declare namespace backgroundTaskManager {
+    /**
+     * The info of delay suspend.
+     *
+     * @name DelaySuspendInfo
+     * @since 7
+     * @sysCap SystemCapability.Ressched.BackgroundTaskMgr
+     * @devices phone, tv, wearable, tablet, car
+     */
+    interface DelaySuspendInfo {
+        /**
+         * The unique identifier of the delay request.
+         */
+        requestId: number;
+        /**
+         * The actual delay duration (ms).
+         */
+        actualDelayTime: number;
+    }
+
+    /**
+     * Cancels delayed transition to the suspended state.
+     *
+     * @since 7
+     * @sysCap SystemCapability.Ressched.BackgroundTaskMgr
+     * @devices phone, tv, wearable, tablet, car
+     * @param requestId Indicates the identifier of the delay request.
+     */
+    function cancelSuspendDelay(requestId: number): void;
+
+    /**
+     * Obtains the remaining time before an application enters the suspended state.
+     *
+     * @since 7
+     * @sysCap SystemCapability.Ressched.BackgroundTaskMgr
+     * @devices phone, tv, wearable, tablet, car
+     * @param requestId Indicates the identifier of the delay request.
+     * @return The remaining delay time
+     */
+    function getRemainingDelayTime(requestId: number, callback: AsyncCallback<number>): void;
+    function getRemainingDelayTime(requestId: number): Promise<number>;
+
+    /**
+     * Requests delayed transition to the suspended state.
+     *
+     * @since 7
+     * @sysCap SystemCapability.Ressched.BackgroundTaskMgr
+     * @devices phone, tv, wearable, tablet, car
+     * @param reason Indicates the reason for delayed transition to the suspended state.
+     * @param callback The callback delay time expired.
+     * @return Info of delay request
+     */
+    function requestSuspendDelay(reason: string, callback: Callback<void>): DelaySuspendInfo;
+}
+
+export default backgroundTaskManager;
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